0001237899-04-000020 4 1 20040301 20040303 REGENERON PHARMACEUTICALS INC 0000872589 2834 133444607 NY 1231 777 OLD SAW MILL RIVER RD TARRYTOWN NY 10591-6707 9143477000 BROWN MICHAEL S 0001174475 4 34 000-19034 04644830 C/O PFIZER INC 235 EAST 42ND ST ATTN: CORPORATE SEC NEW YORK NY 10017 2127334802 4 1 edgardoc.xml PRIMARY DOCUMENT